As Kurt Vonnegut (1922--) has written his novels to give warnings about the growing danger of society, in the case of valuation, it is very important to understand what happened in his time and how his works resulted from a historic background. In the late of 1970's and 80's, society underwent a few big changes, for example, signs of communism collapse on a line of the Soviet Union's perestoroika, Japanese rapid economic growth, the unbalanced world economy by the heavy fall in stock prices in America and, in the field of science, the progress of computer technology in the use of a semiconductor instead of a vacuum tube. The mentioned above data were input into Vonnegut's Brain Computer. As a result, Galápagos was publishied in 1985, Hocus Pocus in 1990. In this paper, I analyzes Vonnegut's works from such a point of view, laying stress on Galápagos and Hocus Pocus.